Carburetor for internal-combustion engines



July 7, 1925. 1,544,636 7 F. H. DE VEULLE CARBURETOR FOR INTERNAL COMBUSTION ENGINES Filed Aug. 2, 19 21 llll II the rest of the induction tube.

Patented July 7,1925.

* PATENT .O F'I mnirnn or BIRMINGHAM, ENGLAND.

neuron-FOR INTERNAL-COMBUSTION ENGINES. 7

Application filed August 2, 1921. Serial No. 489,223.

(GRANTED UNDERTHE PROVISIONS or trim [ACT or nancnaieznm smrpn, 1313.

To all whom it may concern: a

Be it known that I, FREDERICK -HENRY DE VEULLE, a subject of the Kingof Eng land, residing at Handsworth, Birmingham, 1

England, have invented certain new and useful Improvements in Carburetors 'for Internal Combustion Engines (for which I have filed applications inGreat-Britaimi April 30, 1914, Patent No. 10,649 in France, March 17, 1920, application No. #124,495,

and in Germany, March 4,1920, application No. 15,366), of which the following isua' r ing a transverse bore specification. p I

This invention relatesto carburetors of the kind having a tubular valve with a jet outlet arranged at one end of theyalve,

the valve being movable either by. sliding or rotating soas to control the admissionof air to the jet outlet and the delivery of mixture from the spraying chamber or induction tube.

It is the object of the presentinvention to provide means whereby the surface opposite the fuel nozzle and within the walls of the valve conforms in the fully open position of the valve, with the shape of Usually the induct-ion tube gradually reduces in diameter from the intake towards the jet nozzle and therefrom increases again. If the shape of the chamber near the jet nozzle differs widely from the rest of the spraying chamber for example, because of projecting parts of a throttle valve, or adaptation of shape of the induction tube to seat the throttle, turbulence takes place, reducing the quantity of mixture passing to the engine, which is an important point at high engine speeds. Generally the shape at this point does not conform to the shape of the rest of the spraying chamber.

Accordingly I overcome this objection by employing in conjunction with a valve of the kind specified a fixed passage inside the valve which conforms with the shape of the rest of the spraying chamber. For instance the surface .opposite to the jet nozzle may be integral with a part which carries the jet nozzle or the equivalent. p

The accompanying drawings show one method of carrying out this invention, the carburetor in this case being provided with a sliding cylindrical throttle valve. In these,

passage.

Figure 2 1s a similar view 7 of part. of the'carburetor dismantled.

Figure 3 is a planview. of the part-shown in Figure 2, and,. I

valve.-

out the drawings. 7

vThe-invention comprises a casing'10 hav 11 and a longitudinal .Figureg4 is an. elevation of the throttle,

Like figures indicate like parts throughbore 12. A block 13 is. disposed in-the I transverse bore of the-casing and, has, a transverse bore l4whicharegisters with the longitudinal bore --12'to f form an induction: passage for supplying 'combustible; mixture to an engine. A thin annular space or slot- 15 is left between the block and the casing to receive a tubular throttle valve 16, which may be rotatable but is preferable slidable therein. In the present instance the throttle slides in the slotand is prevented from rotating by a key 17. The valve may be raisedby a Bowden wire 18 and seated by a spring 19.

The induction passage formed by the bores 12 and 14 is preferably of Venturi shape and is designed to have a substantially smooth and continuous surface. When the throttle is fully open there are no parts projectinginto the passage, and the slot 15 is so narrow that from a practical standpoint the inner surface of the wall is continuous. It will also be noted a fuel chamber 23 may be formed in the upper part of the well by a plug 24 placed between the ends of the recess 20;

Any suitable extra air' valve such asv 25 may also be used with device, if desired.

least possible resistance to the passage of mixture and to prevent all e-ddying and turbulence which causes a reduction in the quantity of mixture supplied.

It is to be understood that the invention is not limited to the particular details of construction which have been described for the sake of illustration, but inc'hides modificatlons which. come within the scope of the appended claims.

VVh-at I claim my invention and desire to secure by Letters Patent: is

1. In acarburetor, in combination a casing having a bore therein a block disposed in the casing and having a trans verse bore u "lrich registers with the bore in the casing to form a substantially coir- 'tinuous induction passage, a fuel inlet in said passage and a tubular throttle member disposed around the block and adapted toobstruct said passage.

2. In a: carburetor, in combination, a cas-- ing having a longitudinal and a transverse bore', a block disposed concentrically within the transverse bore and having a bore therein which registers with the longitudinal bore to form a substantially continuous induction passage, a fuel inlet in said passage, and a tubular throttle member disposed in the transverse bore and around the block.

3. In. a carburetor, in combination, an induction tube a fuel inlet therein, said tube havingv asubstantially smooth and continuous inner surface and having a circular slot intersecting all the elements of said surface, and a tubular throttle member disposed in said slot.

42. a carburetor, in combination. a cusing' having; a longitudinal bore therein, a block disposed in the casing and having .a transverse bore which registers with the longitu'dlnal bore to: form a substantially continuous induction passage, a: fuel inlet 111 said block, and a tubular throttle member disposed around the block and in al u ment with the fuel inlet. L

In testimony whereof I- have signed my name to this specification in the presence of two subscribing witnesses.

FREDERICK HENRY DE VE UELE.

lVitnesses A ms HORATIO WALKER, KENNETH E. Q. (loans. 

